Home Inspection - Slight Bow In Exterior Wall

[Jeff Stansberry]

Hello!

I'm under contract to purchase a 4 unit building and the home inspector found a slight bow in the wall (See Picture). Not only could the inspector refer anyone to me for a structural inspection, but all the structural engineers I called won't do anything during the home buying process to influence or discourage the buyers decision. The siding is not the issue, since when pressed on it does not move, he's certain that it's the wall. 

Has anyone seen or dealt with an issue like this? If so, what was the outcome? It looks like I will either walk away or have to take my chances on this one and get an inspection after it's in my name. Thoughts? This is in Danville, Illinois by the way..

Thanks for any input!